Contributions to the biology of the Philippine Archipelago and adjacent regions, vol. 6 . Papers on Philippine diatoms, annelids, hydroids, echinoids, and mollusks, pt. 6: The Philippine land mollusks of the genus <I>Opisthoporus/ EMPHASIS_HERE</I>
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Contributions to the biology of the Philippine Archipelago and adjacent regions, vol. 6 . Papers on Philippine diatoms, annelids, hydroids, echinoids, and mollusks, pt. 6: The Philippine land mollusks of the genus Opisthoporus/ EMPHASIS_HERE